it's reminiscent of how efps were built in iraq when that technology came in from iran and the insurgents started using efps where they would shake the charge in such a way the charge was directed effectively, very significant piece of information. >> it sounds like it becomes a bigger bomb that you can have a small device but if it is a metal device -- >> and closed. >> -- and break apart it has a greater impact. >> when it goes off inside the sealed thing, it creates that much more pressure and when the whole thing explodes it all becomes shrapnel, if there's shrapnel in there as well, that would explain a lot. it would not have had to been, per se, an enormous explosive device. >> it's one thing to watch the picture. it's dramatic and chaotic on television, it's on the web or internet here, but it's another thing when you are steps away from where the explosion happened. that's another experience. pete crawford, he knows what it's like. he was actually mile 26 when the first bomb went off. pete is joining us now. pete, we're so glad, first of all that you're safe, that you're okay. i k